Reversing mechanism.



PATENTED NOV. s, 1903.

J. A. BJUR;

REVERSING MECHANISM.

APPLICATION FILED 1mg. 11. 1903.

N0 MODEL.

Patented November 3, 1 903.

PATENT OFFICE.

JOHN ARTHUR BJUR, OF KULM, NORTH DAKOTA.

REVERSING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 743,228, dated November3, 1903.

Application filed March 11, 1903. Serial No. 147,324. (No model.)

To all whom it may concern.-

Be it known that 1, JOHN ARTHUR BJUR, a citizen of the United States,residing at Kulm, in the county of Lamoure and State of North Dakota,have invented a new and useful Reversing Mechanism, of which thefollowing is a specification.

This invention relates to mechanism for re- 1 versing engines andvarying the position of their valves; and it consistsin the featureshereinafter described and claimed.

In the accompanying drawings, Figure l is a top plan view of oneembodiment of the invention. Fig. 2 is a central vertical section ofFig. 1, showing the eccentric and eccentric-support at its intermediateposition. Fig. 3 is a vertical section showing. the position of theeccentric and eccentric-support at one extreme point of its movement.Fig. 4 is a vertical section showing the position of the eccentric andeccentric-support at the other extreme position. Fig. 5 is a top planview of a modified form of my invention, and Fig. 6 is a sectional viewon the line 6 6 of Fig. 5 looking in the direction of the arrow.

Like characters indicate corresponding parts throughout all the figuresof the drawings.

The numeral 10 designates a crank-shaft of an engine which is providedwith one or more spiral ribs 11 encircling the shaft. About said shaftis a sleeve 12, having an opening 13, through which the shaft extendseccentric to its axis and provided along the walls of said opening withspiral grooves 13, into which the ribs 11 project. The sleeve may carrya collar 14, turning loosely thereon in a groove 15, and to this collaris connected the usual form of a reversing-lever- Collars 16 16 may befastened to the shaft at each side of the sleeve to limit its movementtherealong. About the sleeve is a valve-operating member of the engine,here shown as an eccentric 17, having encircling it the strap 18 withthe connecting-rod 19. The eccentrio-opening 20 of this main eccentricis preferably provided withone or more spiral ribs or projections 21,which cooperate with spiral grooves 22 in the exterior of the sleeve12.Stop members 24 24, secured to any fixed portion of the engine-frame,contact with the op posite sides of the eccentric to prevent its lateralmovement while permitting its free rotation. The elements are soproportioned and limited in movement and their grooves and engagingprojections so formed that when the reversing-lever is at one extremeposition the sleeve will be in proximity to one of the stop-collars 16,and the axes of the eccentrics will lie upon the same. side on the axisof the crank-shaft, giving sufficient throw to move the valve throughits full stroke. Then as the sleeve is moved toward the oppositestop-collar by the reversing-lever the eccentric axes are moved aboutthe shaft by the engagementof the spiral ribs and projections inopposite directions, gradually decreasing the stroke of the valve untilat the middle position of the reversinglever they are at substantiallyequal distances upon opposite sides and the valve will receive nomotion. As the reversing-lever is pushed by the central position theeccentric axes begin to approach one another from opposite directionsand the valve reverses the engine. Finally, as the movement is continuedto the limit and the sleeve reaches the opposite stop-collar the valvehas imparted to it the full reverse stroke.

It will be seen that this improved reversing mechanism is extremelycompact and simple to make and use, that it has few contacting surfacesto wear loose, and that it will operate smoothly and effectually.

In the modification shown in Figs. 5 and 6 the operation is the same. Inthis form the sleeve 25 is provided with straight grooves on both itsexterior and interior, the exterior grooves being represented by thenumeral 26 and the interior grooves by the numeral 27,

the crank shaft 10 in this form being provided with straight parallelribs 11, which enter the grooves 27 on the interior of the sleeve 25.The eccentric 17 is also provided with ribs or projections 21, whichenter the grooves 26 on the exterior of the sleeve 25. The encirclingstrap or band is designated by the numeral 18, and 19 designates theconnecting-rod.

The invention having been thus described, whatis claimed is- 1. Areversing mechanism comprising a valve-operating member and aneccentricsupport provided with cooperating spiral grooves andprojections, and means for moving the support relatively to the memberwhereby the position of the axis of said member is varied.

2. A reversing mechanism comprising a crank-shaft, an eccentric-sleevesurrounding the crank-shaft, a main eccentric surronnding the sleeve,and means for connecting these elements whereby longitudinal movement ofthe sleeve will rotate the main eccentrio.

3. A reversing mechanism comprising a crank-shaft, an eccentric-sleevesurrounding the crank-shaft, a main eccentric surrounding the sleeve,and means for connecting these elements whereby a longitudinal movementof the sleeve will rotate both said sleeve and the main eccentric.

4. A reversing mechanism comprising a crank-shaft, an eccentric-sleeveand a main eccentric successively surrounding and contacting with oneanother, each pair of contacting elements being provided withcooperating spiral grooves and projections.

5. A reversing mechanism comprising a crank-shaft, an eccentric-sleeveand a main eccentric successively surrounding and contacting with oneanother, each pair of contacting elements being provided withcooperating spiral grooves and projections, means for moving the sleevelongitudinally, and means for preventing longitudinal movement of theeccentric.

6. A reversing mechanism comprising a crank-shaft provided with spiralprojections,

an eccentric-sleeve having spiral grooves engaged by said projectionsand external spiral grooves, and a main eccentric provided withprojections entering the grooves in the exterior of the sleeve.

7. A reversing mechanism comprising a crank-shaft provided with spiralprojections, an eccentric-sleeve having spiral grooves engaged by saidprojections and external spiral grooves, and a main eccentric providedwith 45

